<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form class="login_form" label-width="0px" :model="loginForm" :rules="loginRules" ref="loginRef">
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-xiong" v-model="loginForm.username"></el-input>
        </el-form-item>
        <el-form-item prop="password">
          <el-input type="password" prefix-icon="iconfont icon-mima" v-model="loginForm.password">
          </el-input>
        </el-form-item>
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单验证规则对象
      loginRules: {
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮, 重置登录表单
    resetLoginForm () {
      this.$refs.loginRef.resetFields() // this.$refs.loginRef是表单的实例对象
    },
    login () {
      this.$refs.loginRef.validate(async valid => {
        console.log(valid)
        if (valid) {
          // 如果返回值是Promise, 可以用async await修饰,来简化结果;
          // 返回值中只有里面的data有用, 在这里直接解构并重命名
          const { data: res } = await this.$http.post('login', this.loginForm)
          console.log(res)
          if (res.meta.status !== 200) {
            return this.$message.error(res.meta.msg)
          }
          this.$message.success(res.meta.msg)
          // 1. 将登录成功之后的'token', 保存到客户端的 sessionStorage 中
          //  1.1 项目中除了登录之外的其他API接口, 必须在登录之后才能访问
          //  1.2 token 只应在当前网站打开期间生效, 所以将 token 保存在 sessionStorage 中
          window.sessionStorage.setItem('token', res.data.token)
          // 2. 通过编程式导航跳转到后台主页, 路由地址是 /home
          this.$router.push('/home')
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  position: relative;
  height: 100%;
  background-color: #2b4b6b;
}
.login_box {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 450px;
  height: 300px;
  background: #fff;
  .avatar_box {
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 130px;
    height: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  // box-sizing: content-box;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>
